The sucker rod couplings produced by our factory include sucker rod couplings and sub couplings. They are all designed in accordance with API Spec 11B and made of high-quality carbon steel or alloy steel. Under normal circumstances, there are two wrench squares on the coupling and outer circle, but a square coupling without a wrench can also be provided according to user needs. The hardness of T-grade coupling after heat treatment is HRA56-62, which has good corrosion resistance and wear resistance.
When in use, sucker rod couplings are used to connect sucker rods of the same size, and sub couplings are used to connect sucker rods of different sizes or connect polished rods and sucker rod strings.
Please note that using sucker rod couplings on polished rods can cause the coupling to break.